- Install Hitman Codename 47 via steam
- Go to desktop mode, then to Discover and install Protontricks
- Open Protontricks and double click Hitman: Codename 47: 6900
- Choose the option “Select the default wineprefix”, then ok
- Choose the option “Install a Windows DLL or component”, then ok
- Click the checkbox of the “directmusic” package, then ok for the last time.
- Close Protontricks and enjoy the game.

I accept all types of constructive criticism, this is "my" very first guide.

I want to thank Bisonfan95, without his protondb post, there would not be any guide regarding this particular issue.

https://www.protondb.com/app/6900#1bQFRiyNDZ

Sorry for my bad english.